There were seven guardian spirits in the original book of " Street of Souls "? Which seven? Why is the seventh most anticipated

There were indeed seven guardian spirits in the original book of "Soul Street": [1 Black Hound: Originally one of the guardian spirits of the Street of Souls, it later became the guardian spirit of the Underworld.] 2. Fox Demon Little Matchmaker: A demon with the characteristics of a fox. She is one of the guardian spirits of the street and also one of the guardian spirits of the underworld. 3. Early White Month: A human with the Spirit of the Early White Month is one of the Guardian Spirits of the Street of Souls and also one of the Guardian Spirits of the Underworld. 4 Yaksha: An evil spirit from the ghost realm who serves as one of the guardian spirits of Zhenhun Street and one of the guardian spirits of the underworld. 5. Spirit Hound: A loyal spirit dog that serves as one of the guardian spirits of the street and one of the guardian spirits of the underworld. 6. Phoenix: A fire-type monster who is one of the guardian spirits of the street and also one of the guardian spirits of the underworld. [7. Emperor of the Underworld: A royal who possesses the power of the Underworld. He is one of the Guardian Spirits of the Street of Souls and also one of the Guardian Spirits of the Underworld.] The reason why the seventh one was the most anticipated was probably because he had some unique abilities and background, but he was also a very important character. His identity, background, and personality were very mysterious, making people very curious.